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Fgf8 Expression Defines a Morphogenetic Center Required For Research article 5211 Fgf8 expression defines a morphogenetic center required for olfactory neurogenesis and nasal cavity development in the mouse Shimako Kawauchi1, Jianyong Shou1,*, Rosaysela Santos1, Jean M. Hébert2, Susan K. McConnell3, Ivor Mason4 and Anne L. Calof1,† 1Department of Anatomy and Neurobiology, and Developmental Biology Center, University of California, Irvine, CA 92697-1275, USA 2Department of Neuroscience and Molecular Genetics, Albert Einstein College of Medicine of Yeshiva University, Bronx, NY 10461, USA 3Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA 4MRC Centre for Developmental Neurobiology, New Hunt’s House, King’s College London, Guy’s Campus, London SE1 1UL, UK *Present address: Lilly Research Labs-Functional Genomics, Eli Lilly and Company, Indianapolis, IN 46285, USA †Author for correspondence (e-mail: [email protected]) Accepted 23 September 2005 Development 132, 5211-5223 Published by The Company of Biologists 2005 doi:10.1242/dev.02143 Summary In vertebrate olfactory epithelium (OE), neurogenesis domain undergo high levels of apoptosis, resulting in proceeds continuously, suggesting that endogenous signals cessation of nasal cavity invagination and loss of virtually support survival and proliferation of stem and progenitor all OE neuronal cell types. These findings demonstrate that cells. We used a genetic approach to test the hypothesis that Fgf8 is crucial for proper development of the OE, nasal Fgf8 plays such a role in developing OE. In young embryos, cavity and VNO, as well as maintenance of OE Fgf8 RNA is expressed in the rim of the invaginating nasal neurogenesis during prenatal development. The data pit (NP), in a small domain of cells that overlaps partially suggest a model in which Fgf8 expression defines an with that of putative OE neural stem cells later in gestation. anterior morphogenetic center, which is required not only In mutant mice in which the Fgf8 gene is inactivated in for the sustenance and continued production of primary anterior neural structures, FGF-mediated signaling is olfactory (OE and VNO) neural stem and progenitor cells, Development strongly downregulated in both OE proper and underlying but also for proper morphogenesis of the entire nasal cavity. mesenchyme by day 10 of gestation. Mutants survive gestation but die at birth, lacking OE, vomeronasal organ Key words: FGF, Vomeronasal organ, Neurogenesis, Olfactory (VNO), nasal cavity, forebrain, lower jaw, eyelids and epithelium, Nasal cavity, Stem cell, Apoptosis, Cre recombinase, pinnae. Analysis of mutants indicates that although initial Fgf8, Foxg1, Sox2, Pax6, Mash1, Neurogenin 1, Ncam1, Pyst1, Shh, NP formation is grossly normal, cells in the Fgf8-expressing Dlx5, Neuronal progenitor, Mouse mutant Introduction 2003; Garel et al., 2003; Grove and Fukuchi-Shimogori, 2003; Members of the fibroblast growth factor (FGF) superfamily of Irving and Mason, 2000; Ohkubo et al., 2002; Trainor et al., signaling molecules have important effects on cell 2002). More recently, the idea has emerged that FGF8 is proliferation, developmental patterning, cell growth and involved in survival and/or maintenance of specific developing homeostasis in virtually all tissues in higher vertebrates cell populations that ultimately give rise to particular (Ornitz, 2000). In the nervous system, studies in vitro and in components of the nervous system (Chi et al., 2003; Mathis et vivo have shown that FGFs promote proliferation, al., 2001; Storm et al., 2003). differentiation and survival of most neural cell types, including Mouse olfactory epithelium (OE) provides a useful model stem cells and neuronal progenitors (DeHamer et al., 1994; system with which to understand how neurogenesis is Eckenstein, 1994; Ford-Perriss et al., 2001; Reuss and von regulated at the cellular and molecular levels. Studies in vitro Bohlen und Halbach, 2003; Temple and Qian, 1995). FGF8 in and in vivo have demonstrated four distinct developmental particular appears to play an important role in developing stages in the neuronal lineage of established OE: neural stem nervous system, although the mechanism(s) by which it acts cells, which express the transcription factor Sox2; Mash1 have not been elucidated fully. FGF8 was first identified as a (Ascl1 – Mouse Genome Informatics)-expressing committed mitogen (Tanaka et al., 1992), and some data support a neuronal progenitors, the progeny of the stem cells; Ngn1- mitogenic role for FGF8 in neural tissues (Xu et al., 2000; Lee expressing immediate neuronal precursors (INPs), the progeny et al., 1997). However, a number of studies indicate that FGF8 of Mash1+ progenitors; and olfactory receptor neurons acts as a neural morphogen, which regulates expression of (ORNs), which differentiate from daughter cells of INP downstream genes that control neural patterning (Fukuchi- divisions and can be identified by expression of the neural cell Shimogori and Grove, 2001; Fukuchi-Shimogori and Grove, adhesion molecule, NCAM1 (Beites et al., 2005; Calof et al., 5212 Development 132 (23) Research article 2002; Kawauchi et al., 2004). Interestingly, the OE is one of maintained as homozygotes. Offspring were genotyped using primers the few regions of the nervous system in which neurogenesis to differentiate between flox and wild-type alleles by amplicon size and nerve cell renewal take place throughout life (Murray and (300 bp and 200 bp, respectively; F1 forward primer, 5Ј-CTTA- Calof, 1999). This capacity for continual neurogenesis GGGCTATCCAACCCATC-3Ј; F2 reverse primer, 5Ј-GGTCTC- Ј d2,3 suggests that cells within the OE produce signals that stimulate CACAATGAGCTTC-3 ). The Fgf8 (null for Fgf8 function) this process. (Meyers et al., 1998) and Foxg1-Cre (Hebert and McConnell, 2000) lines were maintained as hemizygotes (termed Fgf8d2,3/+ and In a previous study, we have shown that several FGFs, Foxg1Cre/+) on an outbred Swiss Webster (Charles River) background particularly FGF2, are potent stimulators of neurogenesis in and genotyped with specific primers: (1) Fgf8d2,3/+ (200 bp amplicon), cultured OE, where they promote divisions of OE neuronal F1 forward primer; F3 reverse primer, 5Ј-AGCTCCCG- transit amplifying progenitors and maintain the stem cells that CTGGATTCCTC-3Ј; (2) Foxg1Cre (200 bp amplicon), C1 forward give rise to these progenitors (DeHamer et al., 1994). primer, 5Ј-GCACTGATTTCGACCAGGTT-3Ј; C2 reverse primer, 5Ј- Moreover, a number of FGFs, including FGF2, are expressed GCTAACCAGCGTTTTCGTTC-3Ј. R26R mice were maintained as in and around OE at various stages of development (DeHamer homozygotes (R26RlacZ/lacZ) and genotyped using lacZ-(5Ј-CCAA- et al., 1994; Hsu et al., 2001; Kawauchi et al., 2004; Key et CTGGTCTGAGGAC-3Ј and 5ЈACCACCGCACGATAGAGATT-3Ј) al., 1996). However, two observations argue that FGF2 is or R26R locus-specific primers (Soriano, 1999). unlikely to be a crucial regulator of developmental Detection of gene expression neurogenesis in the OE. First, mice with targeted inactivation Whole-mount X-gal staining of mouse embryos was performed as of the Fgf2 gene show few if any defects in developmental described (Murray et al., 2003). For RT-PCR, E10.5 frontonasal tissue neurogenesis (Dono et al., 1998; Ortega et al., 1998). Second, (including forebrain and olfactory pit) RNA was purified using Trizol Fgf2 is not highly expressed in mouse OE until postnatal ages (Invitrogen). PCR primers were set to detect cDNA coding for Fgf8 (Hsu et al., 2001; Kawauchi et al., 2004) (S.K. and A.L.C., exon 2 and exon 3 (forward, 5Ј-GTGGAGACCGATACTTTTGG-3Ј; unpublished). Because Fgf8 has been reported to be expressed reverse, 5Ј-GCCCAAGTCCTCTGGCTGCC-3Ј). Cycling parameters in the frontonasal region near the olfactory placodes (Bachler were denaturation at 96°C for 20 seconds, annealing at 55°C for 30 and Neubuser, 2001; Crossley and Martin, 1995; Mahmood et seconds and elongation at 72°C for 1 minute, for 35 cycles. al., 1995), we hypothesized that it may serve as a signal Section in situ hybridization for E8.5-E17.5 embryos was promoting neurogenesis during early OE development. performed as described (Murray et al., 2003). For two-color in situ, one probe was synthesized using fluorescein-12-UTP and detected To test this hypothesis, we analyzed expression of Fgf8 and using AP-conjugated anti-fluorescein Fab fragments from sheep its actions on OE neurogenesis in vivo, using a conditional with INT/BCIP as the chromagen/substrate mix (Roche). For whole- genetic approach in which the Fgf8 gene was inactivated in mount in situ hybridization, E9.5-10.5 embryos were fixed overnight mouse OE from the earliest stages of OE development. Tissue in 4% paraformaldehyde in PBS with 2.5 mM EGTA at 4°C and culture assays were also used to investigate effects of processed as described (Kawauchi et al., 1999). Probes used in this recombinant FGF8 on OE neurogenesis. Expression analysis study were: ORF of mouse Fgf8 (GenBank Accession Number Development indicated that Fgf8 is initially transcribed in a small domain – MMU18673); 463 bp of mouse Fgf18 (520-983 bp of GenBank which we have termed the morphogenetic center – at the rim #AF075291); 748 bp of mouse Sox2 (1281bp-2029 bp of GenBank of the invaginating neural pit. These Fgf8-expressing cells give Accession Number X94127); and mouse Pyst1 (Dusp6 – Mouse rise to new cells that both contain Fgf8 mRNA and express Genome Informatics) (Dickinson et al., 2002). Unless otherwise indicated, Fgf8 expression was detected using a probe generated markers of OE neural stem cells. Analysis of FGF8 signaling from the full-length Fgf8 ORF cDNA (GenBank Accession and cell death demonstrate that, as a consequence of Fgf8 Number MMU18673) (Mahmood et al., 1995). Fgf8 ex1, ex2,3 inactivation, cells within the morphogenetic center and in and int probes were generated in our laboratory by PCR adjacent developing neuroepithelium undergo apoptosis. As a amplification of genomic DNA or cDNA. The int probe consists of consequence, although initial invagination of the nasal pit (NP) bp 2464-3142 of the 3274 bp intron sequence between exons 3 and and initiation of the OE neuronal lineage take place, both NP 4 (Ensemble #ENSMUST00000026241).
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